1; RUN: opt < %s -basicaa -gvn -asan -asan-module -S | FileCheck %s
2; ASAN conflicts with load widening iff the widened load accesses data out of bounds
3; (while the original unwidened loads do not).
4; http://code.google.com/p/address-sanitizer/issues/detail?id=20#c1
5
6
7; 32-bit little endian target.
8target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
9
10%struct_of_7_bytes_4_aligned = type { i32, i8, i8, i8}
11
12@f = external global %struct_of_7_bytes_4_aligned , align 4
13
14; Accessing bytes 4 and 6, not ok to widen to i32 if sanitize_address is set.
15
16define i32 @test_widening_bad(i8* %P) nounwind ssp noredzone sanitize_address {
17entry:
18  %tmp = load i8, i8* getelementptr inbounds (%struct_of_7_bytes_4_aligned, %struct_of_7_bytes_4_aligned* @f, i64 0, i32 1), align 4
19  %conv = zext i8 %tmp to i32
20  %tmp1 = load i8, i8* getelementptr inbounds (%struct_of_7_bytes_4_aligned, %struct_of_7_bytes_4_aligned* @f, i64 0, i32 3), align 1
21  %conv2 = zext i8 %tmp1 to i32
22  %add = add nsw i32 %conv, %conv2
23  ret i32 %add
24; CHECK: @test_widening_bad
25; CHECK: __asan_report_load1
26; CHECK: __asan_report_load1
27; CHECK-NOT: __asan_report
28; We can not use check for "ret" here because __asan_report_load1 calls live after ret.
29; CHECK: end_test_widening_bad
30}
31
32define void @end_test_widening_bad() {
33  entry:
34  ret void
35}
36
37;; Accessing bytes 4 and 5. Ok to widen to i16.
38
39define i32 @test_widening_ok(i8* %P) nounwind ssp noredzone sanitize_address {
40entry:
41  %tmp = load i8, i8* getelementptr inbounds (%struct_of_7_bytes_4_aligned, %struct_of_7_bytes_4_aligned* @f, i64 0, i32 1), align 4
42  %conv = zext i8 %tmp to i32
43  %tmp1 = load i8, i8* getelementptr inbounds (%struct_of_7_bytes_4_aligned, %struct_of_7_bytes_4_aligned* @f, i64 0, i32 2), align 1
44  %conv2 = zext i8 %tmp1 to i32
45  %add = add nsw i32 %conv, %conv2
46  ret i32 %add
47; CHECK: @test_widening_ok
48; CHECK: __asan_report_load2
49; CHECK-NOT: __asan_report
50; CHECK: end_test_widening_ok
51}
52
53define void @end_test_widening_ok() {
54  entry:
55  ret void
56}
57